Fix CRLF line endings and update documentation

- Fix CRLF to LF on all .sh and .py files (now work in Codespaces and Docker)
- Add detailed Codespaces instructions to README with visual guide
- Add script reference table showing which scripts for each platform
- Add .gitattributes to prevent future CRLF issues
- Update tracking/scripts.yaml with Codespaces scripts documentation

Author: cosmelab

.gitattributes

@@ -0,0 +1,13 @@
+# Normalize all text files
+* text=auto
+
+# Shell scripts MUST use LF (for Linux/Codespaces)
+*.sh text eol=lf
+*.bash text eol=lf
+
+# Python scripts use LF
+*.py text eol=lf
+
+# Windows batch files use CRLF
+*.bat text eol=crlf
+*.cmd text eol=crlf